diff --git a/build.zig b/build.zig
index 4bfe9987e..406fc1942 100644
--- a/build.zig
+++ b/build.zig
@@ -9,6 +9,7 @@ const font = @import("src/font/main.zig");
 const renderer = @import("src/renderer.zig");
 const terminfo = @import("src/terminfo/main.zig");
 const config_vim = @import("src/config/vim.zig");
+const fish_completions = @import("src/build/fish_completions.zig");
 const build_config = @import("src/build_config.zig");
 const BuildConfig = build_config.BuildConfig;
 const WasmTarget = @import("src/os/wasm/target.zig").Target;
@@ -404,6 +405,18 @@ pub fn build(b: *std.Build) !void {
         }
     }
 
+    // Fish shell completions
+    {
+        const wf = b.addWriteFiles();
+        _ = wf.add("ghostty.fish", fish_completions.fish_completions);
+
+        b.installDirectory(.{
+            .source_dir = wf.getDirectory(),
+            .install_dir = .prefix,
+            .install_subdir = "share/fish/vendor_completions.d",
+        });
+    }
+
     // Vim plugin
     {
         const wf = b.addWriteFiles();
diff --git a/src/build/fish_completions.zig b/src/build/fish_completions.zig
new file mode 100644
index 000000000..120ef4586
--- /dev/null
+++ b/src/build/fish_completions.zig
@@ -0,0 +1,164 @@
+const std = @import("std");
+
+const Config = @import("../config/Config.zig");
+const Action = @import("../cli/action.zig").Action;
+const ListFontsConfig = @import("../cli/list_fonts.zig").Config;
+const ShowConfigOptions = @import("../cli/show_config.zig").Options;
+const ListKeybindsOptions = @import("../cli/list_keybinds.zig").Options;
+
+/// A fish completions configuration that contains all the available commands
+/// and options.
+pub const fish_completions = comptimeGenerateFishCompletions();
+
+fn comptimeGenerateFishCompletions() []const u8 {
+    comptime {
+        @setEvalBranchQuota(10000);
+        var counter = std.io.countingWriter(std.io.null_writer);
+        try writeFishCompletions(&counter.writer());
+
+        var buf: [counter.bytes_written]u8 = undefined;
+        var stream = std.io.fixedBufferStream(&buf);
+        try writeFishCompletions(stream.writer());
+        return stream.getWritten();
+    }
+}
+
+fn writeFishCompletions(writer: anytype) !void {
+    {
+        try writer.writeAll("set -l commands \"");
+        var count: usize = 0;
+        for (@typeInfo(Action).Enum.fields) |field| {
+            if (std.mem.eql(u8, "help", field.name)) continue;
+            if (std.mem.eql(u8, "version", field.name)) continue;
+            if (count > 0) try writer.writeAll(" ");
+            try writer.writeAll("+");
+            try writer.writeAll(field.name);
+            count += 1;
+        }
+        try writer.writeAll("\"\n");
+    }
+
+    try writer.writeAll("complete -c ghostty -f\n");
+
+    try writer.writeAll("complete -c ghostty -l help -f\n");
+    try writer.writeAll("complete -c ghostty -n \"not __fish_seen_subcommand_from $commands\" -l version -f\n");
+
+    for (@typeInfo(Config).Struct.fields) |field| {
+        if (field.name[0] == '_') continue;
+
+        try writer.writeAll("complete -c ghostty -n \"not __fish_seen_subcommand_from $commands\" -l ");
+        try writer.writeAll(field.name);
+        try writer.writeAll(if (field.type != bool) " -r" else " ");
+        if (std.mem.startsWith(u8, field.name, "font-family"))
+            try writer.writeAll(" -f  -a \"(ghostty +list-fonts | grep '^[A-Z]')\"")
+        else if (std.mem.eql(u8, "theme", field.name))
+            try writer.writeAll(" -f -a \"(ghostty +list-themes)\"")
+        else if (std.mem.eql(u8, "working-directory", field.name))
+            try writer.writeAll(" -f -k -a \"(__fish_complete_directories)\"")
+        else {
+            try writer.writeAll(if (field.type != Config.RepeatablePath) " -f" else " -F");
+            switch (@typeInfo(field.type)) {
+                .Bool => try writer.writeAll(" -a \"true false\""),
+                .Enum => |info| {
+                    try writer.writeAll(" -a \"");
+                    for (info.fields, 0..) |f, i| {
+                        if (i > 0) try writer.writeAll(" ");
+                        try writer.writeAll(f.name);
+                    }
+                    try writer.writeAll("\"");
+                },
+                .Struct => |info| {
+                    if (!@hasDecl(field.type, "parseCLI") and info.layout == .Packed) {
+                        try writer.writeAll(" -a \"");
+                        for (info.fields, 0..) |f, i| {
+                            if (i > 0) try writer.writeAll(" ");
+                            try writer.writeAll(f.name);
+                            try writer.writeAll(" no-");
+                            try writer.writeAll(f.name);
+                        }
+                        try writer.writeAll("\"");
+                    }
+                },
+                else => {},
+            }
+        }
+        try writer.writeAll("\n");
+    }
+
+    {
+        try writer.writeAll("complete -c ghostty -n \"string match -q -- '+*' (commandline -pt)\" -f -a \"");
+        var count: usize = 0;
+        for (@typeInfo(Action).Enum.fields) |field| {
+            if (std.mem.eql(u8, "help", field.name)) continue;
+            if (std.mem.eql(u8, "version", field.name)) continue;
+            if (count > 0) try writer.writeAll(" ");
+            try writer.writeAll("+");
+            try writer.writeAll(field.name);
+            count += 1;
+        }
+        try writer.writeAll("\"\n");
+    }
+
+    for (@typeInfo(ListFontsConfig).Struct.fields) |field| {
+        if (field.name[0] == '_') continue;
+        try writer.writeAll("complete -c ghostty -n \"__fish_seen_subcommand_from +list-fonts\" -l ");
+        try writer.writeAll(field.name);
+        try writer.writeAll(if (field.type != bool) " -r" else " ");
+        try writer.writeAll(" -f");
+        switch (@typeInfo(field.type)) {
+            .Bool => try writer.writeAll(" -a \"true false\""),
+            .Enum => |info| {
+                try writer.writeAll(" -a \"");
+                for (info.fields, 0..) |f, i| {
+                    if (i > 0) try writer.writeAll(" ");
+                    try writer.writeAll(f.name);
+                }
+                try writer.writeAll("\"");
+            },
+            else => {},
+        }
+        try writer.writeAll("\n");
+    }
+
+    for (@typeInfo(ShowConfigOptions).Struct.fields) |field| {
+        if (field.name[0] == '_') continue;
+        try writer.writeAll("complete -c ghostty -n \"__fish_seen_subcommand_from +show-config\" -l ");
+        try writer.writeAll(field.name);
+        try writer.writeAll(if (field.type != bool) " -r" else " ");
+        try writer.writeAll(" -f");
+        switch (@typeInfo(field.type)) {
+            .Bool => try writer.writeAll(" -a \"true false\""),
+            .Enum => |info| {
+                try writer.writeAll(" -a \"");
+                for (info.fields, 0..) |f, i| {
+                    if (i > 0) try writer.writeAll(" ");
+                    try writer.writeAll(f.name);
+                }
+                try writer.writeAll("\"");
+            },
+            else => {},
+        }
+        try writer.writeAll("\n");
+    }
+
+    for (@typeInfo(ListKeybindsOptions).Struct.fields) |field| {
+        if (field.name[0] == '_') continue;
+        try writer.writeAll("complete -c ghostty -n \"__fish_seen_subcommand_from +list-keybinds\" -l ");
+        try writer.writeAll(field.name);
+        try writer.writeAll(if (field.type != bool) " -r" else " ");
+        try writer.writeAll(" -f");
+        switch (@typeInfo(field.type)) {
+            .Bool => try writer.writeAll(" -a \"true false\""),
+            .Enum => |info| {
+                try writer.writeAll(" -a \"");
+                for (info.fields, 0..) |f, i| {
+                    if (i > 0) try writer.writeAll(" ");
+                    try writer.writeAll(f.name);
+                }
+                try writer.writeAll("\"");
+            },
+            else => {},
+        }
+        try writer.writeAll("\n");
+    }
+}